Electric hammer



Mayzs, 1935. Ew BADCON 2,002,762

ELECTRIC HAMMER Filed Feb. 12, 1934 'lll /lllllllllll /4 I v ATTORNEYPatented May 28, 1935 UNITED STAT/Es ELECTRIC HAMMER Eber Watson Badcon,Seattle, Wash., assignor to Resilent Hammer, Inc., Seattle, Wash., acorporation Application February 12, 1934, Serial No. 710,9 63

1 Claim. (Cl. 125-33) This invention relates to improvements in electrichammers, or as they are sometimes called power hammers.

An object of the present inventionis to provide a hammer electricallyoperated to keep the cost of operation at a minimum.. y Y

Broadly, the invention comprises a power hammer with resilient means toprevent crystallization of the machine parts by having a striker backedup by'a spring in a device which will oscillate and is pivoted to ahammerbase and to have the striker in line with the tool at the time ofimpact, which will be revolved around on the inside of a housing at highspeed to give the striker velocity which will deliver one power blow tothe tool each revolution.

With these and other objects in view, as will become more apparent asthe description proceeds, the invention consists in certain novelfeatures of construction, combination and arrangements of parts as willbe hereinafter more fully described and claimed in reference to thedrawings, in which is illustrated the embodiment there- In the drawings,Figure 1 is an elevation partly in section taken through my improvedhammer.

Fig. 2 is a cross section taken through the same showing its workingparts.

Similar reference gures indicate corresponding parts in the drawings.Numeral 4 designates the motor, which is provided with two handles, oneon each side, and is in line with the tool and having its motor inclosedin a housing, while the forward extremity 6 is adapted to receive a tool8. The inner portion of the tool is reduced in size and the outerportion is provided with a device III to permit it to come out a fixeddistance, and is guided in bushing I2. The shank I4 of the tool is shownround to t'the bushing I2, but this may be square or hexagonal in orderto keep the tool from revolving. |6iis the device that holds the strikerI 8 and spring 2U. The said device is bored and counter-bored toaccommodate the striker and has a. shoulder at 2|, which the springbutts against to take the shock of the blow from the machine parts. 22is a bushing which is screwed into the device to hold the spring againstthe shoulder on the hammer I8. 24 is the pivot pin which device issecured to the hammer base. 26-28 is the drive shaft and is integraltherewith, to which the worm gear is made fast. 30 is the hammerhousing. 3| and 32 are the bearings. These bearings are shown `thejack-shaft and wormgear together.

in double ball races, but it will be understood that roller bearings maybe employed. 34 and 35 are the worm and worm gear which drive the hammerbase. 36 is the jack-shaft that drives the worm gear. 38 is the sleevethat couples 40 and 4I are the bearings for'the jack-shaft and wormgear. 42 is the gear that drives the worm gear, which is in mesh withmotor pinion; this is secured to the motor shaft. 46 is an oil-tightbulkhead so that worm gear 35 can run in oil. Both 46 and 4l' are tworemovable side plates which hold the hammer bearings. The hammer base isrecessed at 48 so that the device which holds the striker andspring'rnay oscillate therein to pass the tool after each revolution asit is revolved in the direction of the arrow A. 50 and 5I arecapsscrewed on to hold the bearings in place. At 52 I have shown a portionof the bulkhead and motor housing broken away to show the gearing andjack-shaft. 53 and 54 are handles to hold the machine when in workingposition. 55 is the push button of the electric switch which turns onand off the'electric current. At 56, I have shown the electric wire. i

In operation, the shaft 28 is rotated rapidly in the direction of thearrow A, causing the hammer to deliver one blow each revolution upon thetool 8. Coupled to the shaft 28 is a worm gear which is in mesh with theworm 34, this is driven by a jack-shaft which has at its top end a gear42 secured thereto, which is in meshV with the motor pinion 44, which isxedly secured to a mo'- tor on the inside of the housing 4. YThis motoris started by a switch in the handle at 55,`and the electric current isturned 01T and on as the operator desires.

It will be understood that this machine is not limited to any particularkind of a hammer, but may be adapted for drilling, cutting stone,cutting I cement, breaking and drilling of all kinds, such as in minesand other places.

Having thus described my invention, Vwhat I claim is:

An electric hammer comprising a casing, a hammerV base rotatably mountedin the casing, power means associated with the casing for rotating thehammer base, an arm` pivotally connected to the hammer base; a strikermember carried by said arm and resilient means positioned between saidstriking member and said arm.

EBER WATSON BADCON.

